Thanks Ray,
Your photo of the Pilote locking mechanism looks very similar but not quite the same as mine - when I need to disassemble it again I will take more photos.
I also had a look on EBay and found a similar lock for an Elddis caravan but won’t commit to buying until I make further comparisons.
I like your ‘bungee’ repair, perhaps we should start a post showing our emergency repairs when travelling?😉